Archaeologists have long debated the relationship of psychedelics to rock art. New evidence from Pinwheel Cave in California clarifies the connection.

Exploding volcanoes, not an extraterrestrial impact, probably caused the Earth to suddenly cool about 13,000 years ago, researchers say.

Researchers say DNA from stone tools from in a Mexican cave suggests humans first arrived in America about 15,000 years earlier than previously thought.

"Until now, no one was really sure why this region's earliest inhabitants were exploring underground cave systems."

New research suggests corrugated metal pipes might not be the best option for letting bats into caves and mines while keeping people out.

The archaeologist who analyzed the ayahuasca-containing fox-snout pouch calls it "the most amazing artifact I've had the privilege to work with."

Thousands of ancient rat bones offer clues to the habitat of the mysterious hominin H. floresiensis, who stood about 3 feet 6 inches tall.

Scientific cave divers have discovered at least one new species: another eyeless and colorless remipede.

Flowstones, such as stalactites and stalagmites, are offering researchers new information about fossils from the "Cradle of Humankind."